Surfacing machine for commutators



L. A. SCHAUER AND E. C. MYERS. SURFACING MACHINE FOR COMMUTATORS.

APPLICATION FILED JUNE 1. 1920.

19%1 699 1 Patented May 23, 1922.

aw 37 M 30 .3 J15 w t "we a SURFACING ll/IAOHINE FOR COMPIZ'UTATOERS,

rail enei.

Application filed June 7,

To all whom it may concern:

Be it known that We, LE A. SoHAUnR and ERNEST C. MYERS, citizens of the United States 01% America, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new i and useful Improvements in Surfacing Machines tor Commutators, of Which the following is a specification.

The present invention relates to surfacing machines for commutators as commonly used on automobile engines, and the present surfacing and truing device is particularly designed to be of service in connection with commutators oi the type used on Ford automobile engines. The device in hand possesses thetollowing advantages which will be brought out more fully as the description proceeds. The surfacing machine which we have devised is very simple in construction, and in the number of parts, many of the elaborate minor parts commonly found in devices of this kind, being purposely eliminated. and yet the 'WOI'k pertermed on the commutators in the way oi? facing); the internal annular band of the latter is just perfect as the more elaborately designed surfacing machine.

A. means of l'iolding the commutator on the device while being surfaced is -provided, and also a means is provided tor increasing or decreasing the pressure exerted by the cutting tool, according to the desired compression against the face oi the commutator ring, as will be further explained hereinafter. .Qther features will also be described below.

In the drawings :torming part of this specification, we have illustrated one complete example of our invention. in which:

Figure 1 is an end view of the device taken from the left 0i Figure 2.

Specification of Letters Patent.

Patented iilay $3,1Ei22. 1920. serial no. 38?,131.

Figure 7 is a front view of the cutting tool shown in Figure 6..

Figure 8 is a perspective view oi a modified form of cutting tool.

The numeral 1 indicates a metal holder or chuck having an integral supporting mem her 2, provided with jaws 3, 4- for attaching the device to a bench 5., by means oi; the screw (5 as shown in Figure 2. The enlarged end. 7 Of the chuck 1 is cut away at 8, 8, and a revoluble member 28 passes through the holder stem 2'? as shown in Figure .2. The end 9 oi the member 28 is screw-tl'ireaded preferably at 10, so that the collar-like inember 11, can be rigidly mounted thereon. The member 11 has a projection 12 provided with a radially disposed chamber 39, a cutting tool 13 slidably mounted therein. J-r slotted aperture, 14, and a pin form a means of securing-the tool 13 against removal from the member 1].. The cutting tool 13 is of shape shown in Figures 5, 6 and 7 and the bottom thereof being made as shown in Figure 5, indented or out into sharpened cutting edges like those of a file, For cutting the face 16 of the annular commutator ring 17, but it is understood that any other form of cutting edge can be used on the cutting tool 13, if desired. such as the edge shown in Figure 8, or the like. A. spring can be inserted in the slot at 18 tohcld the tool [3 in a re tracted position it desired, butthis is found not essential in practice, as the tool can be placed at itshighest position as seen from an inspection of Figure 2, in which case it is seen that the tool 13 will at once take a rctracted position due to gravity, and so the commutator 19, and ring 17 can at once he placed in position on the chuck, without any interference from the cutting tool 13, as is readily understood. The chuck 1 has a number oi indentations 20, 20 adapted to receive the wire connection projections 21, 21, etc, tl'iereby preventing the commutator from turning; on the chuck 1 when the tool 13 is revolved. A. revoluble band 22 pivoted on the chuck at 23, and having a screw 24 adapted to engage in the end of the coinmutator at 25 is used or holding the commutator 19 on the. holder 1, and against the shoulder 26 formed on the holder 1.. When desired the band holder 22 can be thrown up to position at 29, in order to remove the commutator 19 from the chuck as is readily appreciated.

0n the end 30 oi. the revoluble member 28 is mounted the handle 31, by means of the screw-thread 38, or in any other suitable mannenso that thehandle and spindle 28 are rigidly held together, and when the handle 31 is revolved that with it the member 28, and collar 11 move as a unit to operate the tool 13. Within the revoluble spindle 28 is rotatably mounted the adjusting screw 32, which is operated along the pipe 28 by means of the screw threads 35, and thumb prongs The outer end 35 of adjusting screw 32 is beveled, so that as the screw 32 is advanced outwardly to the left as seen in Figure 2, that the cutting tool 13 is pushed outwardly and in more insistent contact with the ring 17 ot the commutator 19. This enables the operator to use any amount of pressure on the ring when truing and facing same desired, and when the commutator is to be removed after surfacing. by retracting screw 32 to the right the tool 13 at once becomes loose, and enables the commutator to be removed from the chuck 1. The screw 82 may be locked in adjusted position by the small screw 36 if desired, the latter being: mounted in the portion 37 of the handle 31. From which it is seen that I have provided a device of very few parts, and 0t exceedingly simple construction, which readily accomplishes the work of retacing the inner rings of commutators for automobile engines.

We claim 1. In a surfacing machine for commutators, a chuck, a revoluble spindle mounted therein, a cutting tool on the end of the spindle, and means "for adjusting the intensity of pressure exerted by the cutting tool when the revoluble spindle is operated.

2. In a surfacing machine for commutators, a chuck, a revoluble spindle mounted therein, a cutting tool on the end of the spindle, an adjusting screw mounted within said spindle, and a cone-shaped end on the adjusting screw adapted to adjust the intensity of pressure exerted by said tool when the aforesaid spindle is operated.

3. In a surfacing machine for commutators, a chuck, a revoluble spindle mounted therein, a collar on the end of said spindle, a radially disposed chamber formed in the collar and spindle. a cuttin tool having a slotted shank adapted to reciprocate within said chamber. a securing pin passing through the collar and shank slot, an adjusting,- screw having a cone-shaped end adapted to engage against the end of the cutting tool shank, and means for locking the revoluhle spindle and adjusting screw together when the said spindle is operated.

4. In a surfacing machine for commutators, a chuck, a revoluble spindle axially mounted therein, a retractable cutting tool on the end of the spindle, an adjusting screw co-axially mounted within the revoluble spindle, and having a cone-shaped end adapted to adjustahly engag against the inner end oi the cutting; tool. means for holding the cutting) tool in a rctriwted position when a commutator ir: being" placed in position on the chuck, a pivotally mounted revoluble band on the chuck having a thumbsz-rew passing thercthrough to hold the said commutator in position in a longitudinal direction when the aioresaid rcvolublc spindle is operated.

5. In a surfacing machine tor coininuta tors. a chuck having an cnlar ,'ed end. an annular recess formed in said end adapted to receive the end ot a commutator. a semi circular baud pirotally mounted on the chuck, havin a thumb-screw passing there through to term a longitudinal 'lli'ill; means 'l'or said commutator. means lor prc venting revolution oi the conunutatoc on the chuck. a lGYOlUlJlC spindle carried in chuclt, a retractable cutting tool on the spindle. an adjusting screw within the upindlc engaging against the end o l the cutting tool. and means i or locking the spindle and adjusting screw together when the rerolublc spindle is operated.

6. In a commutator grinder a chuck. a reroluble spindle mounted therein. a collar having: a radially disposed projection thereon, carried on the end ol the spindle. a radially disposed chamber in said projection. a cutting tool having a slotted shank reciprocating within said chamber. an arc-shaped cutting: edge on the cutting tool. a pin mounted in the collar projection and passing through the shank slot tor preventing disengagement oi the cuttiimtool. adjustable means or controlling; the intensity o l pres sure exerted by the cutting; tool. and means for operating the rcrolublc spindle bc'l'ore describml.

7. In a commutator grinder. a collar havin; a radially disposed projection thereon, a radial chamber in said projection. cuttin; tool having a slotted shank. reciprocating); within said chambenan arc-shaped cutting edge on the cutting tool. a pin mounted in the collar projection and passing; through the shank slot for preventing discnmureincnt of the cutting tool from the aforesaid collar eh amber.

In testimony whereot we all}: our signatures.

LEO A. Fitlliil l lll.

(7. MYERS.

li itnesses WILLIAM A. HmTLn, lVALno P. BnnnnEN. 

